How to Zero-Pad Numbers in Go Using fmt.Printf?

Zero-Padding Numeric Strings in Go

When printing integers or creating strings in a fixed width format, it can be useful to zero-pad the value to make it easier to read and compare. This can be achieved using the versatile fmt package in Go.

Problem:

How do you zero-pad a number when printing or converting it to a string to ensure a fixed width?

Solution:

The fmt package provides a convenient formatter for zero-padding numbers:

fmt.Printf("|%06d|%6d|\n", 12, 345)

Explanation:

The d format specifier indicates that the number should be printed in a field of width 6 and padded with zeros if necessary. The second argument, m, specifies a field width of 6 but does not include any padding.

Example:

Consider the following example:

package main

import "fmt"

func main() {
    fmt.Printf("|%06d|%6d|\n", 12, 345)
}

Output:

|000012|   345|

As you can see, the number 12 is zero-padded to a width of 6.

Additional Resources:

• [fmt Package Documentation](https://golang.org/pkg/fmt/)
• [Zero-Padding Numbers Playground](http://play.golang.org/p/cinDspMccp)

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